I was told by a notable researcher that 90% of the marshall protocol patients would not recover since it did not address the coinfections/viruses present. I was on the protocol and JackieCalifornia and I discussed it. That is why I am using a LLMD with a newer approach. My MP Dr did not even consider testing me for "other" infections. But Ree is correct that the Benicar helps the effacy of the antibiotics.
To my knowledge, there are no doctors certified in the Marshall Protocol, but there are doctors willing to prescribe it. There is a website called curemyth1.org where there is a forum about the Marshall Protocol. You can register and ask for a list of doctors who use the Marshall Protocol in your area. I believe I used this function years ago and got a list of doctors. My doctor who I have now uses Benicar, however does not follow all aspects of the protocol. She says the Benicar helps the antibiotics work better which I guess is the theory behind the Marshall Protocol. You can also try to google "marshall protocol doctors" and see what comes up.
You could try searching online for 'marshall protocol ohio' and see what you get.
Also Marshall's office is in Thousand Oaks CA, north of LA, and the phone number is easy to find in an online search. I don't know if his office gives out contact information to docs who use that method, but you could try. They might have a website etc. to refer you to.
I don't know of anyone posting here who has used it, but would be interested to hear if you do and how it works out.